--- a/Gemfile	Sat Jun 06 22:36:32 2015 +0900
+++ b/Gemfile	Sun Jun 07 02:35:12 2015 +0900
@@ -3,6 +3,7 @@
 gem "rails", "~> 4.2.0"
 gem "jquery-rails"
 gem "coffee-rails", "~> 4.1.0" # Rails 4.2 default
+gem "autoprefixer-rails"
 
 # Bundle edge Rails instead:
 # gem "rails", :git => "git://github.com/rails/rails.git"
@@ -14,7 +15,6 @@
 gem "sass-rails", "~> 5.0" # Rails 4.2 default
 
 gem "uglifier", ">= 1.3.0" # Rails 4.2 default
-gem "bootstrap-sass"
 
 gem "therubyrhino", :platforms => :jruby